摘要
研究了在模拟自然光照射条件下,环丙沙星在水相中的光降解行为,以及水中存在的无机氮对其光降解的影响.结果表明,随着环丙沙星初始浓度的增加,其光降解率逐渐降低;水中溶解氧的含量会影响其光解速率,水中溶解氧含量越高,环丙沙星光解速率越小;硝酸根对环丙沙星光降解起促进作用,亚硝酸根起抑制作用,铵根几乎没有影响.当环境pE值逐渐增加时,无机氮的形态经历了由NH4+到NO2-,再到NO3-的变化,相应地,环丙沙星的光降解速率先减小后增大.当硝酸根和铵根共存时,两者相互之间不会产生影响;当亚硝酸根和硝酸根共存时,环丙沙星的降解率小于理论降解率,说明亚硝酸根的存在抑制了硝酸根对环丙沙星光降解的促进作用.
This paper investigated the photo-degradation performance of Ciprofloxacin （CFX） under simulated solar irradiation and the effect of inorganic nitrogen in water.The results showed that the photo-degradation rate decreased with the increase of initial concentration of CFX and dissolved oxygen.Nitrate accelerated the photo-degradation rate whereas nitrite inhibited it,and ammonium had little effect on it.Along with the increase of pE value,nitrogen form changed from NH＋4to NO-2 or NO-3,the photo-degradation rate of CFX decreased at the beginning and increased afterwards.The experiments showed that there was no interaction between NH＋4 and NO-3.When NO-3and NO-2 coexisted,the photo-degradation rate of CFX was lower than the theoretic rate,which indicated that the facilitation of NO-3 was inhibited because of the existence of NO-2.
出处
《环境科学学报》
CAS
CSCD
北大核心
2011年第11期2409-2415,共7页
Acta Scientiae Circumstantiae
基金
国家水体污染控制与治理科技重大专项(No.2009ZX07211-005-03)~~
关键词
环丙沙星
光降解
不同形态氮
ciprofloxacin
photo-degradation
different nitrogen forms
